Ernest Malalad, chief science research specialist of the Philippine Space Agency (PhilSA) points to a satellite photo of areas affected by nitrogen oxides, at the PhilSA headquarters in Manila on April 30, 2026. The fire at Metro Manila's Navotas landfill is largely invisible to the naked eye, combusting as deep as 15 metres (50 feet) below the surface and releasing a toxic brew of methane as well as carbon dioxide. (Photo by Ted ALJIBE / AFP via Getty Images) / To go with "PHILIPPINES-FIRE-WASTE-ENVIRONMENT-POLLUTION, REPORTAGE" BY PAM CASTRO